summaryrefslogtreecommitdiffstats
path: root/dom/canvas/test/test_2d.composite.canvas.xor.html
blob: 048da5d5f023cfadad7c9fed8996b9e0943de05c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
<!DOCTYPE HTML>
<title>Canvas test: 2d.composite.canvas.xor</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<body>
<canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<script>
function isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
    var pixel = ctx.getImageData(x, y, 1, 1);
    var pr = pixel.data[0],
        pg = pixel.data[1],
        pb = pixel.data[2],
        pa = pixel.data[3];
    ok(r-d <= pr && pr <= r+d &&
       g-d <= pg && pg <= g+d &&
       b-d <= pb && pb <= b+d &&
       a-d <= pa && pa <= a+d,
       "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
}

SimpleTest.waitForExplicitFinish();
addLoadEvent(function () {

var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');


var canvas2 = document.createElement('canvas');
canvas2.width = canvas.width;
canvas2.height = canvas.height;
var ctx2 = canvas2.getContext('2d');
ctx2.drawImage(document.getElementById('yellow75.png'), 0, 0);
ctx.fillStyle = 'rgba(0, 255, 255, 0.5)';
ctx.fillRect(0, 0, 100, 50);
ctx.globalCompositeOperation = 'xor';
ctx.drawImage(canvas2, 0, 0);
isPixel(ctx, 50,25, 191,255,63,127, "50,25", "191,255,63,127", 5);

SimpleTest.finish();

});
</script>
<img src="image_yellow75.png" id="yellow75.png" class="resource">